Medium voltage switchgear
Fuses from 3.6 to 36 kV
Catalogue
2007
0
The Guiding System, the new way to create your
electrical installations
A comprehensive offer of products with consistent design
The Guiding System is first and foremost a Merlin Gerin product
offer covering all electrical distribution needs. However, what
makes all the difference is that these products have been designed
to operate togheter: mechanical and electrical compatibility,
interoperability, modularity, communication.
Thus the electrical installation is both optimised and more efficient:
better continuity of supply, enhanced safety for people and
equipment, guaranteed upgradeability, effective monitoring and
control.
Tools to simplify design and implementation
With the Guiding System, you have a comprehensive range of tools
- the Guiding Tools - that will help you increase your product
knowledge and product utilisation. Of course this is in compliance
with current standards and procedures.
These tools include technical booklets and guides, design aid
software, training courses, etc. and are regularly updated.
For a genuine partnership with you
Because each electrical installation is unique, there is no standard
solution. With the Guiding System, the variety of combinations
allows for genuine customisation solutions. You can create and
implement electrical installations to meet your creative
requirements and design knowledge.
You and Merlin Gerin’s Guiding System form a genuine partnership.
For more details on the Guiding System,
consult www.merlin-gerin.com
0
A consistent design of offers from
Medium Voltage to Low Voltage
All Merlin Gerin offers are designed according to
electrical, mechanical and communication
consistency rules.
The products express this consistency by their
overall design and shared ergonomics.
Electrical consistency:
Discrimination guarantees co-ordination between the operating
characteristics of serial-connected circuit-breakers. Should a
fault occurs downstream, only the circuit-breaker placed
immediately upstream from the fault will trip.
Each product complies with or enhances system performance at coordination level: breaking capacity, Isc, temperature rise, etc. for
more safety, continuity of supply (discrimination) or economic
optimisation (cascading).
The leading edge technologies employed in Merlin Gerin’s
Guiding System ensure high performance levels in discrimination
and cascading of protection devices, electrodynamic withstand of
switches and current distributors, heat loss of devices, distribution
blocks and enclosures.
Likewise, inter-product ElectroMagnetic Compatibilty (EMC) is
guaranteed.
Mechanical consistency:
Each product adopts dimensional standards simplifying and
optimising its use within the system.
It shares the same accessories and auxiliaries and complies with
global ergonomic choices (utilisation mode, operating mode, setting
and configuration devices, tools, etc.) making its installation and
operation within the system a simpler process.
Direct connection of the Canalis KT busbar trunking on the
Masterpact 3200 A circuit breaker.
Communication consistency:
Thanks to the use of standard Web technologies, you can offer
your customers intelligent Merlin Gerin switchboards allowing
easy access to information: follow-up of currents, voltages,
powers, consumption history, etc.
Guiding Tools
for more efficient design
and implementation
of your installations.
Each product complies with global choices in terms of
communication protocols (Modbus, Ethernet, etc.) for simplified
integration in the management, supervision and monitoring
systems.
0
SM6
Sepam
Masterpact
Medium voltage switchboard
system from 1 to 36 kV
Protection relays
Protection switchgear
from 100 to 6300 A
Trihal
MV/LV dry cast resin
transformer
from 160 to 5000 kVA
Evolis
MV vacuum
switchgear and
components
from 1 to 24 kV.
The Technical guide
CAD software and tools
These technical guides help you comply with
installation standards and rules i.e.:
The electrical installation guide, the
protection guide, the switchboard
implementation guide, the technical booklets
and the co-ordination tables all form genuine
reference tools for the design of highperformance electrical installations.
For example, the LV protection co-ordination
guide - discrimination and cascading optimises choice of protection and
connection devices while also increasing
markedly continuity of supply in the
installations.
The CAD software and tools enhance
productivity and safety.
They help you create your installations
by simplifying product choice through
easy browsing in the Guiding System
offers.
Last but not least, they optimise
use of our products while also complying
with standards and proper procedures.
0
Compact
Multi 9
Prisma Plus
Protection switchgear system
from 100 to 630 A
Modular protection switchgear
system up to 125 A
Functional system for electrical
distribution switchboards
up to 3200 A
Pragma
Enclosures for
distribution
switchboards
up to 160 A
Canalis
Prefabricated Busbar
Trunking
from 25 to 4000 A
PowerLogic
Power
management
Training
merlin-gerin.com
Training allows you to acquire the Merlin
Gerin expertise (installation design, work
with power on, etc.) for increased
efficiency and a guarantee of improved
customer service.
The training catalogue includes beginner’s
courses in electrical distribution,
knowledge of MV and LV switchgear,
operation and maintenance of
installations, design of LV installations to
give but a few examples.
This international site allows you to access
all the Merlin Gerin products in just 2 clicks
via comprehensive range data-sheets, with
direct links to:
b complete library: technical documents,
catalogs, FAQs, brochures…
b selection guides from the e-catalog
b product discovery sites and their Flash
animations.
You will also find illustrated overviews,
news to which you can subscribe, the list
of country contacts…
This international site
allows you to access all
the Merlin Gerin products
in just 2 clicks via
comprehensive range
data-sheets, with direct
links to:
b complete library:
technical documents,
catalogs, FAQs,
brochures…
b selection guides from
the e-catalog.
b product discovery sites
and their Flash
animations.
You will also find
illustrated overviews,
news to which you can
subscribe, the list of
country contacts…
These technical guides
help you comply with
installation standards
and rules i.e.:
the electrical installation
guide, the protection
guide, the switchboard
implementation guide,
the technical booklets
and the co-ordination
tables all form genuine
reference tools for
the design of high
performance electrical
installations.
For example, the LV
protection co-ordination
guide - discrimination and
cascading - optimises
choice of protection and
connection devices while
also increasing markedly
continuity of supply in the
installations.
Medium voltage fuses
from 3.6 kV to 36 kV
Contents
Applications
Fuse range selection
2
Main characteristics
3
Fusarc CF, Soléfuse, Tépéfuse, MGK
Construction
5
MV limiting fuses with thermal striker
Construction
6
Fusarc CF
Characteristics and dimensions
References and characteristics
Fuse and limitation curves
7
8
9
Soléfuse
References and characteristics
Fuse and limitation curves
10
11
Tépéfuse, Fusarc CF
Metering transformer protection
12
MGK
References, characteristics and curves
13
Selection and usage guide
General - Transformer protection
Transformer protection - Selection table
Motor protection
Motor protection - Selection charts
14
15
16
17
Capacitor bank protection
Comments on substituting fuses
18
Order form
19
1
Presentation
Applications
058579N
Fuse range selection
Our Fusarc CF, Soléfuse, Tépéfuse and MGK fuses make up a broad, consistent
and uniform range of high breaking capacity fuses and current limitors.
They are all of combined type and are manufactured so that they can be installed
both indoors and outdoors (depending on the type).
Merlin Gerin fuses provide protection to medium voltage distribution devices
(from 3 to 36 kV) from both the dynamic and thermal effects of short-circuit currents
greater than the fuse’s minimum breaking current.
Considering their low cost and their lack of required maintenance, medium voltage
fuses are an excellent solution to protect various types of distribution devices:
b Medium voltage current consumers (transformers, motors, capacitors, etc.)
b Public and industrial electrical distribution networks.
Public distribution
058580N
They offer dependable protection against major faults that can occur either
on medium or low voltage circuits.
This protection can be further enhanced by combining the fuses with low voltage
protection systems or with an overcurrent relay.
Selection table
Depending on the equipment to be protected and its voltage rating, the table below
gives the range of fuses which are best suited to the protection application.
Voltage
(kV)
3.6
Motor protection
7.2
12
17.5
24
36
MGK
(UTE standard;
motor protection)
Fusarc CF
(DIN standard;
transformer, motor and
capacitor protection)
Tépéfuse
(UTE standard;
voltage transformer protection)
2
058578N
Soléfuse
(UTE standard;
transformer protection)
Motors
Fusarc CF
MGK
Fusarc CF
MGK
Fusarc CF
Power
transformers
Fusarc CF
Capacitors
Fusarc CF
Fusarc CF
Soléfuse
Fusarc CF
Soléfuse
Fusarc CF
Soléfuse
Fusarc CF
Fusarc CF
Soléfuse
Fusarc CF
Soléfuse
Fusarc CF
Soléfuse
Fusarc CF
Soléfuse
Fusarc CF
Soléfuse
Fusarc CF
Soléfuse
Voltage
transformers
Fusarc CF
Fusarc CF
Tépéfuse
Fusarc CF
Tépéfuse
Fusarc CF
Tépéfuse
Fusarc CF
Soléfuse
Tépéfuse
Fusarc CF
PE55711
Presentation
Main characteristics
Key characteristics
The most significant features provided by our range of fuses are as follows:
b High breaking capacity
b High current limitation
b Low I2t values
b Dependable breaking of critical currents
b Low breaking overvoltage
b Low dissipated power
b No maintenance or ageing
b For indoor and outdoor applications
b With a thermal striker
b Low minimum breaking current values.
Standards
Our fuses are designed and manufactured according to the following standards:
b IEC 60282-1, IEC 60787 (Fusarc CF, Soléfuse,Tépéfuse, MGK)
b DIN 43625 (Fusarc CF)
b VDE 0670-402 (Fusarc CF)
b UTE C64200, C64210 (Soléfuse, Tépéfuse).
Quality assurance system
In addition to being tested in our own laboratories as well as in official laboratories
such as the CESI, Les Renardiers and Labein, with their own respective certificates,
our fuses are manufactured according to quality guidelines within the framework
of the ISO 9001 and ISO 14001 Quality System Certification awarded by AENOR
(IQ-NET) which provides an additional guarantee for Merlin Gerin products.
Routine testing
During manufacture, each fuse is subject to systematic routine testing, with the aim
of checking its quality and conformity:
b Dimensional control and weight control
b Visual control of markings, labelling and external appearance
b Electrical resistance measurement: a key point to ensure that fuses have
the required performance levels at the end of the production process and to check
that no damage has occurred during assembly.
Measurement of the room temperature resistance of each fuse is therefore carried
out in order to check that they are in line with values, according to their rated voltage
and rated current.
Certified quality: ISO 9001 and ISO 14001
A major advantage
Schneider Electric has a functional organisation whose main mission is to check
quality and monitor compliance with standards in each of its production units.
MESA, the only company in Schneider Electric that makes fuses, is certified
by AENOR (The Spanish Standards Association), and is certified to ISO 9001
and ISO 14001 (IQ-NET).
Furthermore, Merlin Gerin annually carries out internal type-testing and breaking
testing in order to comply with our annual quality assurance plan, which is available
on request to our customers.
b Seal testing: in order to test the sealing of our Fusarc CF fuses, they are immersed
for 5 minutes in a hot water bath (80°C), in accordance with standard IEC 60282-1.
3
DE55750
Presentation
Main characteristics
Key definitions
Un: rated voltage
This is the highest voltage between phases (expressed in kV) for the network
on which the fuse might be installed.
In the medium voltage range, the preferred rated voltages have been set at:
3.6 - 7.2 - 12 - 17.5 - 24 and 36 kV.
In: rated current
This is the current value that the fuse can withstand on a constant basis without
any abnormal temperature rise (generally 65 Kelvin for the contacts).
Safe operating
range
I3: minimum rated breaking current
This is the minimum current value which causes the fuse to blow and break
the current. For our fuses, these values are between 3 and 5 times the In value.
Comment: it is not enough for a fuse to blow in order to interrupt the flow of current.
For current values less than I3 , the fuse will blow, but may not break the current.
Arcing continues until an external event interrupts the current. It is therefore
essential to avoid using a fuse in the range between In and I3.
Overcurrents in this range may irreversibly damage fuse elements, whilst still
maintaining the risk of an arc which is not broken, and of them being destroyed.
Figure 1 shows the operating ranges of combined type fuses.
I2: critical currents (currents giving similar conditions to the maximum arcing
energy). This current subjects the fuse to greater thermal and mechanical stresses.
The value of I2 varies between 20 and 100 times the In value, depending on
the design of the fuse element. If the fuse can break this current, it can also break
currents between I3 and I1.
Figure 1: definition of a fuse’s operating zone.
4
I1: maximum rated breaking current
This is the presumed fault current that the fuse can interrupt. This value is very high
for our fuses ranging from 20 to 63 kA.
Comment: it is necessary to ensure that the network short circuit current is at least
equal to the I1 current of the fuse that is used.
Fuses
Fusarc CF, Soléfuse, Tépéfuse, MGK
DE55751EN
Construction
End contact caps (1)
Force (N)
80
Together with the enclosure, they form an assembly which must remain intact
before, during and after breaking the current. This is why they have to withstand
mechanical stresses and sealing stresses due to overpressure caused by arcing.
The stability of the internal components must also be ensured over time.
70
60
50
Enclosure (2)
40
30
20
10
0
0
5
10
15
20 23 Travel
(mm)
Figure 2: this graph shows the value
of the force provided by the striker
according to its length of travel.
This part of the fuse must withstand certain specific stresses (related to what
has already been mentioned):
b Thermal stresses: the enclosure has to withstand the rapid temperature rise
that occurs when the arc is extinguished
b Electrical stresses: the enclosure has to withstand the restoring of current after
breaking
b Mechanical stresses: the enclosure has to withstand the increase in pressure
caused by the expansion of the sand when breaking occurs.
Core (3)
This is a cylinder surrounded by ceramic fins onto which the fuse element is wound.
The striker control wire together with the latter are fitted in the cyclinder. They are
insulated from the fuse elements.
Fuse element (4)
This is the main component of the fuse. It is made from materials with very low
resistance and which do not wear over time. Our fuse elements are carefully
configured following a lot of testing, to enable us to achieve the required results.
Extinction powder (5)
The extinction powder is made up of high purity quartzite sand (over 99.7%),
which is free from any metal compounds and moisture.
When it vitrifies, the sand absorbs the energy produced by the arc and forms
an insulating compound called fulgurite with the fuse element.
Thermal striker (6)
Contact caps
Enclosure
Core
Fuse element
Extinction powder
Thermal striker
This is a mechanical device which indicates correct fuse operation.
It also provides the energy required to actuate a combined breaking device.
The striker is controlled by a heavy duty wire which, once the fuse element
has blown, also melts and releases the striker. It is very important that the control
wire does not cause premature tripping of the striker, nor must it interfere with
the breaking process.
The Merlin Gerin limiting fuse, with its thermal striker, is not only capable of indicating
and breaking short circuits. It is also capable of this for prolonged overcurrents,
and currents causing significant temperature rises in the devices combined with
the fuses and the fuses themselves.
The thermal strikers installed in our fuses are of “medium type” and their force/travel
characteristics (approximately 1 joule according to standard IEC-60282-1) are shown
in figure 2.
PE55713
PE55712
1
2
3
4
5
6
Figure 3: cross sectional diagram of a fuse
5
Fuses
MV limiting fuses
with thermal striker
PE55717
Construction
All Merlin Gerin fuses (type Fusarc CF) are provided of a thermal protection device.
In the case of permanent overcurrents lower than I3 and superior to the rated
current (In), the fuse mechanical striker acts opening the device associated and
avoiding any incidents due to overheatings.
In this way, the fuse not only works as a current limiter but also as a temperature
limiter when combined with an external breaking device.
These types of fuses, which integrate a thermal striker, are fully compatible with
standard Back UP type fuses.
Figure 1.1 shows thermal protection action zone.
Technical / economic / safety advantages:
The use of a thermal protector in our fuses provides the following advantages:
b Protecting the fuses and their environment from unacceptable temperature rises
in installations equipped with a disconnecting switch with the possibility of automatic
opening
b Providing a response to unexpected operating conditions, to frequent or longlasting
overloads, or to mistakes in selecting the fuse rating, or even concerning restricted
ventilation conditions within the installation
b Indicating and protecting against overloads caused by overcurrents below the
minimum breaking current (I3) of the installed fuse and which can cause dangerous
operating temperatures
b Reducing operating costs due to destruction of equipment or excess costs caused
by loss of quality of service (repair time, staff, etc.).
Fusarc CF fuses installed in a CAS 36 cubicle
This thermal protector safety feature, significantly reduces the risk of damage
and accidents in installations and therefore increases the power distribution quality
of service.
DE55754
The characteristics of the thermal striker fuse (breaking capacity, fuse curves,
limiting values, striker force, etc.) do not vary relative to our fuses without
thermal protection.
Thermal striker
action zone
Figure 1.1: thermal protection
6
Fuses
Fusarc CF
Characteristics and dimensions
Dimensions (mm)
DE55753
Figure 4
Fusarc CF
Striker
Ø*
Ø45
Ø6
33
33
L*
23
* The following page gives the diameter and length
of the fuse according to its rating.
* For other dimensions, please contact our sales department.
This is Schneider Electric’s DIN standard fuse range.
When designing this range, we paid particular attention to minimise power dissipation.
It is increasingly common to use RMU units with SF6 gas as the insulating material.
In view of these operating conditions, in which the fuse is inserted inside a
hermetically sealed fuse chamber, with virtually no ventilation, these fuses avoid
premature ageing of themselves and of the whole device which would otherwise
be caused by a non-optimised fuse.
The enclosure in the Fusarc CF range up to 100 A (rated current) is made from
crystallised brown porcelain which withstands ultra-violet radiation and can therefore
be installed both outdoors and indoors.
Fuses with rated current values greater than 100 A have glass fibre enclosures
and are only for indoor installations.
You will find the full list of the Fusarc CF range in the table given on the following page.
With rated voltages ranging from 3 to 36 kV and rated currents of up to 250 A,
they meet customers’ exact requirements in terms of switchgear short-circuit
protection.
Time/current fuse curves
These curves show the virtual fusion or pre-arcing time, as a function of the value
of the symmetrical component of the intended current. Careful selection and design
of fuse elements, together with meticulous industrial control, provides Merlin Gerin
customers with precise time-current curves, well above the tolerance limits provided
for in standard IEC 60282-1.
When designing our Fusarc CF fuses, we focused on a relatively high fusion current
at 0.1 s in order to withstand transformer making currents and at the same time
a low fusion current at 10 s in order to achieve quick breaking in the case of a fault.
On page 10, we give the time/current characteristics of Fusarc CF fuses.
Current limitation curves
Merlin Gerin fuses are current limiting. Consequently, short circuit currents are
limited without reaching their maximum value. These diagrams show the relationship
between the presumed short-circuit current and the peak value of the current broken
by the fuse. The intersection of these lines with straight lines for Imax symmetrical
and Imax asymmetrical give the presumed breaking current, below which fuses
no longer have their limiting capacity.
For example, as shown in the limitation curves on page 10, for a short-circuit
whose presumed current is 5 kA, in an unprotected installation, the maximum current
value would be 7 kA for symmetrical flow and 13 kA for an asymmetrical case.
If we had used a Fusarc CF fuse with a rated current of 16 A, the maximum value
reached would have been 1.5 kA.
7
Fuses
Fusarc CF
References and characteristics
Table no. 1
Reference
757372 AR
Rated
voltage (kV)
2.000
0.6
58
20
762
20
51006 500 M0
6.3
36
205
12
51006 501 M0
10
34
102
14
51006 502 M0
16
50
68.5
26
51006 503 M0
20
62
53.5
32
51006 504 M0
25
91
36.4
35
51006 505 M0
31.5
101
26
42
40
135
18
46
51006 507 M0
50
180
11.7
44
51006 508 M0
63
215
8.4
52
51006 509 M0
80
280
6.4
68
51006 510 M0
100
380
5.5
85
757352 BN
125
650
3.4
88
757352 BP
160
1.000
2.2
87
757352 BQ
200
1.400
1.8
95
757374 BR
250
2.200
0.9
95
51311 007 M0
4
20
1143
27
3/7.2
250
50
Cold resistance* Dissipated
(mΩ)
power (W)
4
7.2
3/3.6
Min. breaking
current I3 (A)
51311 006 M0
51006 506 M0
3.6
Operating
Rated
Max. breaking
voltage (kV) current (A) current I1 (kA)
63
50
51006 511 M0
6.3
36
319
16
51006 512 M0
10
34
158
18
51006 513 M0
16
50
106
37
51006 514 M0
20
62
82
42
51006 515 M0
25
91
56
52
51006 516 M0
31.5
101
40
59
40
135
28
74
51006 518 M0
50
180
17.4
70
51006 519 M0
63
215
13.8
82
51006 520 M0
80
280
10
102
51006 521 M0
100
380
8
120
757364 CN
125
650
5.3
143
757354 CP
160
1.000
3.5
127
757354 CQ
200
1.400
2.7
172
51006 522 M0
10
34
203
23
51006 523 M0
16
50
132
47
51006 524 M0
25
91
71
72
51006 525 M0
31.5
101
51
78
51006 526 M0
40
135
35
90
51006 517 M0
12
6/12
51311 008 M0
4
51006 527 M0
6.3
51006 528 M0
63
40
40
20
1436
34
36
402
21
10
34
203
25
16
50
132
46
51006 530 M0
20
62
103
52
51006 531 M0
25
91
71
66
51006 532 M0
31.5
101
51
74
51006 533 M0
40
135
35
94
51006 534 M0
50
180
22
93
51006 535 M0
63
215
19.4
121
51006 536 M0
80
330
13.5
145
51006 537 M0
100
450
11
192
51006 529 M0
17.5
10/17.5
31.5
* Resistances are given at ±10% for a temperature of 20°C. Fuses > 100 A rated current,
are manufactured in glass fibre (for indoor use).
8
Length
(mm)
292
192
292
Diameter Weight
(mm)
(kg)
86
3.4
50.5
1
55
1.3
76
2.1
86
442
292
442
3.4
5
50.5
1.2
55
1.8
76
3.2
86
5
50.5
1.2
76
3.2
50.5
1.5
55
2.2
76
3.9
86
4.6
292
367
Fuses
Fusarc CF
References and characteristics
Table no. 1 (continued)
Reference
Rated
voltage (kV)
Operating
Rated
Max. breaking
voltage (kV) current (A) current I1 (kA)
Min. breaking
current I3 (A)
Cold resistance* Dissipated
(mΩ)
power (W)
51108 807 M0
10
36
485
26
51108 808 M0
16
50
158
58
51108 813 M0
20
62
123
67
51108 814 M0
25
91
85
76
51108 809 M0
31.5
101
61
93
51108 810 M0
40
135
42
115
51311 009 M0
4
20
1436
34
51006 538 M0
6.3
36
485
25
51006 539 M0
10
34
248
31
51006 540 M0
16
50
158
58
51006 541 M0
20
62
123
67
51006 542 M0
25
91
85
79
31.5
101
61
96
51006 544 M0
40
135
42
119
51108 915 M0
6.3
38
484
26
51108 916 M0
10
40
248
35
51108 917 M0
16
60
158
64
51108 918 M0
20
73
123
84
51108 919 M0
25
100
88
79
51108 920 M0
31.5
112
61
90
51108 921 M0
40
164
45
120
51108 922 M0
50
233
30
157
51108 923 M0
63
247
23
177
51006 545 M0
50
180
31.5
136
51006 546 M0
63
215
22.8
144
51006 547 M0
80
330
18
200
51006 548 M0
100
450
13.5
240
51311 010 M0
4
20
2109
51
51006 549 M0
6.3
36
750
39
51006 550 M0
10
34
380
50
51006 551 M0
16
50
252
98
51006 543 M0
24
10/24
51006 552 M0
51006 553 M0
40
31.5
20
36
20/36
25
20
62
197
120
91
133
133
51006 554 M0
31.5
101
103
171
51006 555 M0
40
135
70
207
51006 556 M0
50
200
47
198
51006 557 M0
63
250
35
240
Length
(mm)
367
Diameter Weight
(mm)
(kg)
50.5
1.5
55
2.2
76
3.9
50.5
1.7
55
2.6
50.5
1.2
76
3.2
86
5
76
4.5
86
5.7
50.5
1.9
55
3.1
76
5.4
86
6.5
442
292
442
537
* Resistances are given at ±10% for a temperature of 20 °C. Fuses > 100 A rated current,
are manufactured in glass fibre (for indoor use).
9
Fuses
Fusarc CF
Fuse and limitation curves
Time/current characteristics curves
3.6 - 7.2 - 12 - 17.5 - 24 - 36 kV
200 A
250 A
160 A
125 A
100 A
31.5 A
40 A
50 A
63 A
80 A
10 A
16 A
20 A
25 A
6.3 A
1000
8
6
4
4A
DE55755
Time (s)
6
8
1000
2
100
8
6
4
2
10
8
6
4
2
1
8
6
4
2
0.1
8
6
4
2
0.01
2
4
6
10
8
2
4
100
2
4
6
8
10000
Current (A)
Current limitation curves 3.6 - 7.2 - 12 - 17.5 - 24 - 36 kV
DE55756
Maximum value of cut-off current (kA peak)
The diagram shows the maximum limited broken current
value as a function of the rms current value which could
have occurred in the absence of a fuse.
100
8
6
4
Ia
=
8
1.
Ik
Is
2
=
Ik
2
250 A
200 A
160 A
125 A
2
100 A
80 A
63 A
50 A
40 A
10
8
31.5 A
25 A
20 A
16 A
6
4
10 A
6.3 A
2
1
8
4A
6
4
2
0.1
6
8
0.1
2
4
6
8
1
2
4
6
8
10
2
4
6
8
100
Rms value of the presumed broken current (kA)
10
Fuses
Soléfuse
References and characteristics
The Soléfuse range of fuses is manufactured according to UTE standard C64200.
The rated voltage varies from 7.2 to 36 kV. They can be supplied with or without
a striker and their weight is of around 2 kg.
They are mainly intended to protect power transformers and distribution networks,
and are solely for indoor installations (glass fibre enclosure).
Electrical characteristics
Table no. 2
Reference
Rated voltage
(kV)
Operating voltage
(kV)
Rated current
(A)
Min. breaking current Max. breaking current
I3 (A)
I1 (kA)
Cold resistance *
(mΩ)
757328 BC
6.3
31.5
158.6
757328 BE
16
80
51.7
757328 BH
31.5
157.5
757328 BK
7.2
3/7.2
63
315
757328 BN
125
625
50
24.5
11.3
4.8
757328 CM
7.2/12
3/12
100
500
50
7.7
757328 DL
7.2/17.5
3/17.5
40
15.1
80
400
757328 EC
6.3
31.5
445.9
757328 EE
16
80
93.2
757328 EH
31.5
157.5
757328 EJ
43
215
38.5
757328 EK
63
315
18.9
757331EC**
6.3
31.5
447.3
757331EE**
16
80
147.4
757331EH**
12/24
157.5
43
215
39
757331EK**
63
315
19.3
757328 FC
6.3
31.5
618.9
757328 FD
10
50
252.9
30/36
30
45.8
31.5
20
67.9
16
80
757328 FF
20
100
133.2
757328 FG
25
125
124
757328 FH
31.5
157.5
93
207.8
* Resistances are given at ±10% for a temperature of 20°C.
** Fuses with a reference number starting by 757328 have a striker,
those that start by 757331 do not.
Dimensions (mm)
Figure 5
DE55752
36
10/24
30
757331EJ**
757328 FE
12/24
10/24
Striker
520
Ø6
Ø55
35
450
23 max.
Weight: 2.3 kg
11
Fuses
Soléfuse
Fuse and limitation curves
Time/current characteristic curves
7.2 - 12 - 17.5 - 24 - 36 kV
100 A
125 A
1000
8
6
4
16 A
20 A
25 A
31.5 A
43 A
63 A
80 A
6.3 A
10 A
DE55757
Time (s)
2
100
8
6
4
2
10
8
6
4
2
1
8
6
4
2
0.1
8
6
4
2
0.01
2
10
4
6
8
2
100
4
6
8
1000
2
4
6
8
10000
Current (A)
Current limitation curves 7.2 - 12 - 17.5 - 24 - 36 kV
DE55758
Maximum value of cut-off current (kA peak)
The diagram shows the maximum limited broken current
value as a function of the rms current value which could
have occurred in the absence of a fuse.
100
8
6
4
.8
Ia
=
Ik
2
1
2
Is
=
Ik
2
125 A
100 A
80 A
63 A
10
43 A
31.5 A
25 A
20 A
16 A
10 A
8
6
4
6.3 A
2
1
8
6
4
2
0.1
0.1
2
4
6
8
1
2
4
6
8
10
2
4
6
8
100
Rms value of the presumed broken current (kA)
12
Fuses
Tépéfuse, Fusarc CF
(metering transformer protection)
References, characteristics and curves
We manufacture Tépéfuse and Fusarc CF type fuses intended for metering
transformer protection which have the following references and characteristics:
Characteristics
Table no. 3
Type
Tépéfuse
Fusarc CF
Reference
Rated
voltage
(kV)
Operating
voltage
(kV)
781825 A
12
< 12
781825 B
24
13.8/24
51311 002 MO
7.2
3/7.2
51311 000 MO
51311 003 MO
51311 011 MO
51311 001 MO
51311 004 MO
51311 005 MO
12
6/12
17.5
10/17.5
24
10/24
36
20/36
Rated
current
(A)
Max. breaking Min. breaking Cold
Length
current
current
resistance *
I1 (kA)
I3 (A)
(mΩ)
(mm)
0.3
40
6.1
40
301
11.6
2.5
1278
1
63
3834
2.5
1917
2.5
9.5
1
2407
40
2.5
2407
2.5
20
3537
Weight
(mm)
(kg)
27.5
0.4
192
0.9
292
1.2
367
4815
Diameter
50.5
1.5
442
1.6
537
1.8
* Resistances are given at ±10% for a temperature of 20°C.
Tépéfuse fuses are only made in glass fibre when intended for indoor usage.
Fuses for transformer protection are made without strikers, according to figures 6 and 7.
DE55759
Ø 50.5
Ø 45
33
1000
8
6
4
L
DE55760
Tépéfuse (Figure 7)
331
2.5 A (Fusarc CF)
Time (s)
1 A (Fusarc CF)
0.3 A (Tépéfuse)
Fuse curve 7.2 - 12 - 24 - 36 kV
Fusarc CF (Figure 6)
DE55765
Dimensions (mm)
6
8
2
100
8
6
4
Ø27.5
2
15
301
10
8
6
4
2
1
8
6
4
2
0.1
8
6
4
2
0.01
1
2
4
10
2
4
6
8
100
Current (A)
13
Fuses
MGK
References, characteristics and curves
MGK fuses are intended to protect medium voltage motors at 7.2 kV
(indoor application).
Dimensions (mm)
DE55761
Figure 8
Striker
Electrical characteristics
Ø 81
Table no. 4
Reference
55
Rated
voltage
(kV)
Weight: 4.1 kg
Rated
current
(A)
Min. breaking Max. breaking Cold
current
current
resistance *
I3 (A)
I1 (kA)
(mΩ)
757314
100
360
50
6.4
757315
125
570
50
4.6
160
900
50
2.4
757317
200
1400
50
1.53
757318
250
2200
50
0.95
757316
438
Operating
voltage
(kV)
y 7.2
7.2
* Resistances are given at ±10% for a temperature of 20°C.
Fuse curve 7.2 kV
250 A
200 A
1000
8
6
4
160 A
100 A
125 A
DE55762
Time (s)
2
100
8
6
4
2
10
8
6
4
2
1
8
6
4
2
0.1
8
6
4
2
0.01
2
10
4
6
8
2
100
4
6
8
1000
2
4
6
8
10000
Current (A)
Current limitation curve 7.2 kV
DE55763
Maximum value of limited broken current (kA peak)
The diagram shows the maximum limited broken current
value as a function of the rms current value which could
have occurred in the absence of a fuse.
100
8
6
8
4
Ia
=
1.
Ik
Is
2
=
Ik
2
250 A
200 A
160 A
2
125 A
100 A
10
8
6
4
2
1
8
6
4
2
0.1
0.1
2
4
6
8
1
2
4
6
8
10
2
4
6
8
100
Rms value of presumed broken current (kA)
14
Fuses
Selection and usage guide
DE55764
General
Transformer protection
General
Icc
Short circuit
current
According to their specific characteristics, the various types of fuses (Fusarc CF,
Soléfuse, Tépéfuse and MGK) provide real protection for a wide variety of medium
and high voltage equipment (transformers, motors, capacitors).
It is of the utmost importance to always remember the following points:
b Un of the fuse must be greater than or equal to the network voltage
b I1 of a fuse must be greater than or equal to the network short circuit current
b The characteristics of the equipment to be protected must always be taken into
consideration.
Transformer protection
A transformer imposes three main stresses on a fuse. This is why the fuses must be
capable of:
I3
(1)
I
Closing
In
In
Fuse
Transformer
(1) In this current zone, any overloads must be eliminated
by LV protection devices or by a MV switch equipped with
an overcurrent relay.
b … Withstanding the peak start-up current which accompanies transformer
closing
The fuses’ fusion current at 0.1 s must be more than 12 times the transformer’s rated
current.
If(0.1 s) > 12 x In transfo.
b … Breaking fault currents across the terminals of the transformer secondary
A fuse intended to protect a transformer has to break its rated short circuit current
(Isc) before it can damage the transformer.
Isc > If(2 s)
b … Withstanding the continuous operating current together with possible
overloads
In order to achieve this, the fuse’s rated current must be over 1.4 times
the transformer’s rated current.
In fuse > 1.4 In transfo.
Choice of rating
In order to correctly select the fuse’s rated current to protect a transformer,
we have to know and take account of:
b The transformer characteristics:
v power (P in kVA)
v short circuit voltage (Usc in %)
v rated current.
b The fuse characteristics:
v time/current characteristics (If 0.1 s and If 2 s)
v the minimum rated breaking current (I3).
b The installation and operating conditions:
v open air, cubicle or fuse chamber
v presence or otherwise of permanent overload
v short circuit current in the installation
v indoor or outdoor usage.
Comment: whether used in Merlin Gerin’s SM6, RM6, CAS 36 or in a device from another
manufacturer, the equipment manufacturer’s own user’s instructions must be referred to
when choosing the fuse.
15
Fuses
Selection and usage guide
Transformer protection
Selection table
Fusarc CF fuses DIN standard for transformer protection (rating in A) (1) (2) (3)
Table no. 6
Operating Rated
voltage
voltage
(kV)
(kV)
3
7.2
5
7.2
6
7.2
6.6
10
11
13.2
13.8
15
20
22
7.2
12
12
17.5
17.5
17.5
Transformer power
(kVA)
25
50
75
16
25
31.5
40
50
63
63
80
20
31.5 40
50
63
80
80
100
100
125
125
25
40
16
50
25
63
31.5
80
31.5
100
40
100
50
160
80
160
63
125
63
10
20
31.5 40
40
50
63
80
80
100
100
16
6.3
25
16
40
20
50
25
50
31.5
63
40
80
40
100
50
100
63
63
125
80
10
20
25
31.5 40
50
50
63
80
80
100
100
6.3
25
16
31.5
20
40
25
63
31.5
63
40
80
50
100
50
100
63
80
10
20
25
31.5 31.5 40
50
63
63
80
100
100
25
31.5
40
16
40
20
50
25
63
31.5
80
31.5
80
40
100
50
63
125
63
10
16
20
25
31.5 40
40
50
63
80
80
16
20
10
25
16
31.5
20
40
25
50
31.5
63
40
80
50
100
50
100
63
10
16
20
25
31.5 31.5 40
50
63
63
80
80
100
25
16
31.5
16
40
20
40
25
63
31.5
80
40
80
50
100
50
100
63
125
6.3
20
10
10
16
20
20
25
31.5 31.5 40
50
63
63
80
80
10
25
16
31.5
20
40
25
63
40
80
50
80
50
100
63
100
6.3
25
10
10
16
16
20
25
31.5 31.5 40
50
63
63
80
80
20
10
25
16
31.5
16
40
40
25
63
40
80
40
80
50
100
63
100
63
80
80
80
100
6.3
6.3
4
4
4
24
24
100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000
50
25
50
31.5
125
160
200
250
160
125
125
160
200
250
125
125
160
200
250
80
100
125
125
160
100
125
125
125
160
125
20
20
25
31.5 40
50
50
63
10
16
6.3
20
25
10
25
16
31.5
16
40
20
50
25
63
31.5
63
31.5
80
40
50
6.3
10
10
16
20
20
25
31.5 40
40
50
63
63
16
20
10
25
10
25
16
31.5
20
40
25
50
31.5
63
40
10
16
16
20
25
31.5 31.5 40
50
20
10
25
16
31.5
16
40
40
25
10
16
20
20
25
10
6.3
20
25
10
25
16
31.5
16
10
10
16
20
16
20
25
4
36
50
31.5
125
160
16
6.3
6.3
30
40
25
250
10
6.3
36
50
25
200
6.3
10
25
50
25
160
6.3
4
10
6.3
6.3
10
100
100
100
100
100
80
80
100
100
63
100
40
80
50
50
63
80
80
63
40
63
40
80
50
100
100
31.5 40
50
50
63
63
63
40
50
25
63
31.5
63
31.5
40
50
20
25
31.5 40
40
50
63
25
31.5
40
50
63
50
25
50
31.5
50
100
63
63
100
63
Soléfuse fuses UTE standard for transformer protection (rating in A) (1) (2) (3)
Table no. 7
Operating Rated
voltage
voltage
(kV)
(kV)
3
3.3
4.16
5.5
6
6.6
10
11
13.8
15
20
22
30
7.2
7.2
7.2
7.2
7.2
7.2
12
12
17.5/24
17.5/24
24
24
36
Transformer power
(kVA)
25
50
100
125
160
200
250
315
400
500
630
800
1000 1250 1600
16
16
6.3
6.3
6.3
6.3
6.3
6.3
6.3
6.3
6.3
6.3
16
16
16
16
16
16
6.3
6.3
6.3
6.3
6.3
6.3
31.5
31.5
31.5
16
16
16
16
16
16
16
6.3
6.3
6.3
63
31.5
31.5
31.5
31.5
16
16
16
16
16
6.3
6.3
6.3
63
63
31.5
31.5
31.5
31.5
16
16
16
16
16
16
6.3
63
63
63
31.5
31.5
31.5
31.5
16
16
16
16
16
16
80
80
63
63
63
31.5
31.5
31.5
16
16
16
16
16
100
80
80
63
63
63
31.5
31.5
31.5
31.5
16
16
16
100
100
80
63
63
63
43
31.5
31.5
31.5
31.5
16
16
125
125
100
80
80
80
43
43
31.5
31.5
31.5
31.5
16
125
100
100
80
63
63
43
43
43
31.5
31.5
125
100
100
80
63
63
43
43
31.5
31.5
125
125
80
80
63
63
43
43
31.5
100
100
80
80
63
43
(1) Fuse ratings correspond to open air installation with a transformer overload of 30%. or to an indoor installation without transformer overload.
(2) If the fuse is incorporated in a distribution switchboard. please refer to the selection table provided by the manufacturer of this device.
(3) although the ratings shown in bold type are the most appropriate. the others also protect transformers in a satisfactory manner.
16
80
63
Fuses
Selection and usage guide
Motor protection
Fusarc CF selection
for motor protection
Motor protection
When combined with a contactor, fuses provide a particularly effective protection
system for an MV motor.
The specific stresses that fuses have to withstand are due to:
b The motor to be protected
b The network on which it is placed.
Table no. 8
Maximum Start-up
operating current
voltage
Start-up time (s)
5
10
(kV)
(A)
Number of start-ups per hour
6
12
6
12
6
12
1410
1290
1140
1030
890
790
710
640
610
540
480
440
310
280
250
240
230
210
180
170
160
148
133
120
110
98
88
83
73
67
62
57
250
250
250
250
250
200
200
200
200
160
160
160
160
125
125
125
125
100
100
100
100
80
80
80
80
63
63
63
50
50
50
50
3.3
6.6
11
250
250
250
250
250
200
200
200
160
160
160
160
160
125
125
125
125
100
100
100
100
80
80
80
80
63
63
63
50
50
50
250
250
250
250
250
200
200
200
160
160
160
160
160
125
125
125
125
100
100
100
100
80
80
80
80
63
63
63
50
50
50
20
250
250
250
250
250
200
200
200
200
160
160
160
160
125
125
125
100
100
100
100
100
80
80
80
63
63
63
63
50
50
250
250
250
250
250
200
200
200
200
160
160
160
160
125
125
125
100
100
100
100
100
80
80
80
80
63
63
63
50
50
250
250
250
250
250
250
200
200
200
200
160
160
160
160
125
125
125
100
100
100
100
100
80
80
80
80
63
63
63
50
Stresses due to the motor
b The start-up current (Id).
b The start-up duration (Td).
b The number of successive start-ups.
b When the motor is energised, and throughout the start-up period, the impedance
of a motor is such that it consumes a current Id which is significantly greater than
the rated load current In. Normally, this current Id is around 6 times the rated current,
(Id/In = 6).
b The start-up duration Td depends on the type of load that is being driven by
the motor. It is of around ten seconds.
b We also have to take account of the possibility of several successive start-ups
in choosing the fuse rating.
Stresses related to the network
b The rated voltage: the rated voltage for MV motors is at most equal to 11 kV.
b The limited broken current: networks with MV motors are generally high installed
power networks with very high short circuit currents.
Choice of rating
The fuse rating chosen depends on three parameters:
b The start-up current
b The duration
b The start-up frequency.
17
Fuses
Selection and usage guide
Motor protection
Selection charts
η = motor efficiency
The three charts given below enable the fuse rating to be determined when we know
the motor power (P in kW) and its rated voltage (in kV)
Chart 1: this gives the rated current In (A) according to P (kW) and Un (kV).
Chart 2: this gives the start-up current Id (A) according to In (A).
Chart 3: this gives the appropriate rating according Id (A) and the start-up duration
time Td (s).
Ua = rated motor voltage
Id = start up current
Td = start up time
Comments
b Chart 1 is plotted for a power factor of 0.92 and an efficiency of 0.94.
For values different to this, use the following equation:
-------------In = -------------P
h 3Ua – pf
b Chart 3 is given in the case of 6 start-ups spread over an hour or 2 successive
startups.
n
For n successive start-ups (n > 6), multiply Td by — .
6
p
For p successive start-ups (p > 2), multiply Td by — (see selection table).
In the absence of any information, take Td = 10 s.2
b If the motor start-up is not direct, the rating obtained using the charts below may be
less than the full load current of the motor. In this case, we have to choose a rating
20% over the value of this current, to take account of the cubicle installation.
Fuses with a rating chosen using these charts will satisfy fuse ageing tests according
to recommendations in IEC 60644.
100
10
Id (A)
1000
10000
100
100
3
1 2
Td (s)
A 1650 kW motor powered at 6.6 kV
(point A, chart 1) has a current of 167 A (point B).
The start-up current, 6 times greater
than the rated current = 1000 A (point C, chart 2).
2x250A
Td (s)
Example
2x200A
For a start-up time of 10 s,
chart 3 shows a rating of 250 A (point D).
250A
200A
D
10
10
50A
160A
63A
80A
125A
1650 kW
DE55766
100
P (kW)
A
1000
100A
10000
C
1000 A
10
10
In (A)
In (A)
x12
11kV
x10
10kV
x8
6.6kV
100
x6
6kV
5.5kV
B
A
100
167 A
x4
4.16kV
3.3kV
3kV
1000
100
18
P (kW)
1000
10000
10
100
1000
Id (A)
10000
Fuses
Capacitor bank protection
Comments on substituting fuses
Capacitor bank protection
Fuses intended to protect capacitor banks have to withstand special voltages:
b When the bank is energised, the inrush current is very high and can lead to premature
ageing or fusion of the fuse element
b In service, the presence of harmonics can lead to excessive temperature rise.
Choice of rating
A common rule applied to any switchgear in the presence of capacitor banks
is to derate the rated current by 30 to 40% due to the harmonics which cause
additional temperature rise.
It is recommended to apply a coefficient of between 1.7 and 1.9 to the capacitive
current in order to obtain the appropriate fuse rating, i.e. 1.7 or 1.9 times the rated
current of the bank.
As for transformers, it is necessary to know the rms inrush current value and
its duration.
Comments on substituting of fuses
In accordance with recommendation in IEC 60282-1 (Application guide):
« it is recommended to replace all three fuses in a three-phase circuit when
one of them has already blown, unless we are certain that there has been
no over-current in the fuses which have not blown ».
Moreover, in this guide, we can find several basic recommendations
for the correct use of this type of fuse.
It is important to take account of the fact that the striker only acts when all of
the fuse elements have blown. However, if the striker has not been activated,
this does not mean that the fuses have not been subject to an overcurrent.
19
Fuses
Only one of the boxes (ticked X or filled
by the needed value) have to be considered between each
horizontal line.
Order form
Fuses
Quantity
Electrical characteristics
Rated voltage
(kV)
Operating voltage
(kV)
(A)
Rated current
Power
Transformer
Motor
(kVA)
Dimensions
Fuse length
(mm)
Cap diameter
(mm)
Other characteristics
Operating conditions
Open air
Standards
Reference
20
Cubicle
Fuse chamber
Other
89, boulevard Franklin Roosevelt
F - 92500 Rueil-Malmaison (France)
Tel.: +33 (0)1 41 29 85 00
http://www.schneider-electric.com
http://www.merlin-gerin.com
AC0479EN
As standards, specifications and designs change from time to time, please ask for confirmation
of the information given in this publication.
This document has been
printed on ecological paper
Production: Schneider Electric, Graphème
Photos: Schneider Electric
Printing: Imprimerie du Pont de Claix/JPF - Made in France
12-2006
ART72747 © 2006 - Schneider Electric - Tous droits réservés
Schneider Electric Industries SAS